Next up in the "Heat index," house calls are making a comeback with a high-tech twist. It could take weeks or even longer to get an appointment. A new app is bringing the doctor into your home. ABC's Rebecca Jarvis has the details. Could you show me how hard Lilly got hit. A head bounce. How are you feeling? Fine. So is Lilly. Reporter: Like in this episode of "Modern family" doctors' visits respect that pleasant but now the doctor is in 24/7 and you don't even have to leave home. Thanks to a new service called healthtapprime. Can you have a 30-minute video consultation with the doctor any time over your mobile device. Using your smartphone's camera you can ask 1 of the 62,000 doctors to diagnose an illness and write you a prescription. Even in the middle of the night. It was a life saver for work-at-home dad Tristan o'brien. My son and daughter had the flu last week so were able to use it in the middle of the night. You don't necessarily have to be sick to use the app. You can use it for prescriptions, diet plans, even medication reminders. What have you specifically treated through the application? Very commonly we get questions and consults about exercise, nutrition, weight loss, so basically staying heal healthy. Reporter: But there is a price. Healthtap doesn't take insurance. They charge $99 a month and $10 extra per family member for their prime service. There are similar services like doctor on demand and md live which are cheaper but only if you limit your calls to a few times a year. In as parents using health tap prime gives us peace of mind knowing we can contact the doctor 24/7. Reporter: Rebecca Jarvis, ABC news, New York. Joining us with his chief is chief health and medical editor Dr. Richard Besser. Maybe we will be calling you in the middle of night. I think people from ABC little still call me in the middle of the night. A lot of doctors' offices are keying in and making more phone access and e-mail access. It is very convenient to reach someone at any time is a wonderful thing. There are a lot of problems that can be handled over the phone and for people in rural places where there respect a lot of doctors around it gives that kind of access. You can see a lot of upsides but what about the connection you have with your own doctor? That's a point I always like to make. You want to develop a relationship with somebody, knows your real problems. When you call into this service they don't have all your medical records, whatever you entered into that website. If you have complex medical problems that worries me a little bit and they can't examine you except what you show with your phone. Even with a rash I like to touch the rash. How that rash feels gives me a lot of clues -- Are there insurance issues with this? It costs about $100 a month and insurance doesn't cover it so it's a fair amount of upon for that kind of access. My strategy was I married a doctor. What do you think? I think that's perfect. It's worked out well for me because going in I was a hypochondriac. Made a lot of accepts on a lot of different leffs. A wonderful approach but for people -- I love to see rich try to take that question seriously. That is fantastic. But for those who cannot marry a doctor here's what I recommend. You know, when you're looking for a doctor, look for an office that's going to meet your needs that has phone service at night. Has weekend hours, evening hours. That's the way to go. Dr. Richard Besser, thanks for being a good sport.

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